docs: def fetch_previous(self, next_page):
          """
          Fetches the previous page of results of a paginated request. Pass in the
          previous page in its entirety, or the pagination information dict
          returned as a part of that pages first status ('_pagination_prev').
  
          Returns the previous page or None if no further data is available.
          """
          if isinstance(next_page, list) and len(next_page) != 0:
              if hasattr(next_page[0], '_pagination_prev'):
                  params = copy.deepcopy(next_page[0]._pagination_prev)
              else:
                  return None
          else:
              params = copy.deepcopy(next_page)
  
          method = params['_pagination_method']
          del params['_pagination_method']
  
          endpoint = params['_pagination_endpoint']
          del params['_pagination_endpoint']
  
          return self.__api_request(method, endpoint, params)